Anyone done this? We are thinking about using MMC cards to flash upgrade equipment in the field - specifically TI DSP based units. This is in order to upgrade software where niceties such as laptops etc are just not available on site, with the intent of avoiding return to base main PCBs. Although I can't see any basic reason why this can't be done, just wondering if anyone has tried and what snags they came across. Any comments welcome
JohnS
If there is any possible benefit to the user in repurposing or editing your firmware, you'll want to put cryptographically strong verification on your update images.
If you have any sympathy for the user (which most manufacturers don't), then I would also suggest putting a functional basic set of firmware (with reflashing utility) in EPROM, not flash, so that if the flash firmware gets badly screwed up, then the user can return to a basic working situation by setting a clearly marked jumper, rather than unsoldering the flash chip which seems to be needed on some motherboards etc.
Chris
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